/**
 *    Copyright 2009-2015 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.logging.jdbc;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.Statement;

import org.apache.ibatis.logging.Log;
import org.apache.ibatis.reflection.ExceptionUtil;

/**
 * Connection proxy to add logging
 * 
 * @author Clinton Begin
 * @author Eduardo Macarron
 * 
 */
public final class ConnectionLogger extends BaseJdbcLogger implements InvocationHandler {

	private Connection connection;

	private ConnectionLogger(Connection conn, Log statementLog, int queryStack) {
		super(statementLog, queryStack);
		this.connection = conn;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] params) throws Throwable {

		try {

			if (Object.class.equals(method.getDeclaringClass())) {
				return method.invoke(this, params);
			}
			if ("prepareStatement".equals(method.getName())) {
				PreparedStatement stmt = (PreparedStatement) method.invoke(connection, params);
				if (isDebugEnabled()) {
					debug("["+proxy.hashCode()+"] Preparing: " + removeBreakingWhitespace((String) params[0]), true);
				}
				stmt = PreparedStatementLogger.newInstance(stmt, statementLog, queryStack);
				return stmt;
			} else if ("prepareCall".equals(method.getName())) {
				if (isDebugEnabled()) {
					debug(" Preparing: " + removeBreakingWhitespace((String) params[0]), true);
				}
				PreparedStatement stmt = (PreparedStatement) method.invoke(connection, params);
				stmt = PreparedStatementLogger.newInstance(stmt, statementLog, queryStack);
				return stmt;
			} else if ("createStatement".equals(method.getName())) {
				Statement stmt = (Statement) method.invoke(connection, params);
				stmt = StatementLogger.newInstance(stmt, statementLog, queryStack);
				return stmt;
			} else {
				return method.invoke(connection, params);
			}
		} catch (Throwable t) {
			throw ExceptionUtil.unwrapThrowable(t);
		}
	}

	/*
	 * Creates a logging version of a connection
	 * 
	 * @param conn - the original connection
	 * 
	 * @return - the connection with logging
	 */
	public static Connection newInstance(Connection conn, Log statementLog, int queryStack) {
		InvocationHandler handler = new ConnectionLogger(conn, statementLog, queryStack);
		ClassLoader cl = Connection.class.getClassLoader();
		return (Connection) Proxy.newProxyInstance(cl, new Class[] { Connection.class }, handler);
	}

	/*
	 * return the wrapped connection
	 * 
	 * @return the connection
	 */
	public Connection getConnection() {
		return connection;
	}

}
